900

素因数分解:

$2^2\times 3^2\times 5^2$

素因数の和:20

約数の個数: 27

約数和(自身を含む): 2821

約数和(自身を除く): 1921

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 25, 30, 36, 45, 50, 60, 75, 90, 100, 150, 180, 225, 300, 450, 900]

約数ペア:

[(1, 900), (2, 450), (3, 300), (4, 225), (5, 180), (6, 150), (9, 100), (10, 90), (12, 75), (15, 60), (18, 50), (20, 45), (25, 36)]